watchOS 6.0 (build 17R5521e) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2019-07-02T18:10:25Z. The update package is 695.13 MB. This is a delta (partial) update that requires 5.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 799f0d0d03e30c5e9702a033f1ca3f230ec80616.zip.